26.
    发明专利
    未知

    公开(公告)号:DE19705992A1

    公开(公告)日:1998-08-20

    申请号:DE19705992

    申请日:1997-02-17

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing polymers containing carbamate units, wherein polyethylene imines or polymers containing vinyl amine units of formula (III) in which R = H or C1-C6-alkyl are made to react with halogen formic acid esters. The invention also relates to the use of the polyethylene imines containing carbamate groups thus obtained or polymers containing vinyl carbamate units as retention agents, dehydrating agents, flocculants and fixing agents in the production of paper, as a protective colloid for the production of aqueous alkyl diketene dispersions and as a dispersing agent for the production of accumulated aqueous filling material slurries.

    28.
    发明专利
    未知

    公开(公告)号:DE19638594A1

    公开(公告)日:1998-03-26

    申请号:DE19638594

    申请日:1996-09-20

    Applicant: BASF AG

    Abstract: This invention concerns a process for cleaning wastewater and recirculating water in paper production, de-inking and bleaching of pulp. This process involves adsorption of water-soluble anionic compounds and compounds dispersed in water from the wastewater and recirculating water onto fine-particle adsorption agents consisting of insoluble polymers which swell to a very limited extent and contain vinylamine units which have been incorporated by polymerization. This invention further concerns the use of these polymers as adsorption agents for cleaning water recirculation systems in the production of paper and for cleaning paper machine wastewater and discharge from the de-inking process and from pulp bleaching.

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